Since these comparisons are in an all time sense, and the guy playing in a lower scoring period of time has a bunch more powerplay goals than the guy being sold as having the capability to run an entire powerplay.. I think that is pretty significant even if PP goals don't tell the whole story with regards to powerplay effectiveness.

PP goals don't even come close to telling the whole story. So one guy has more goals because he shot more. Tomas Kaberle never shoots, yet he's considered among the best PP QBs in the league. Your passing ability, not shooting ability, is what makes you a dangerous PP player as a defenseman.